/*
 * MIT License
 *
 * Copyright (c) 2023 北京凯特伟业科技有限公司
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.je.bpm.engine.impl.event;

import com.je.bpm.engine.impl.context.Context;
import com.je.bpm.engine.impl.interceptor.CommandContext;
import com.je.bpm.engine.impl.persistence.entity.HistoricTaskInstanceEntity;

public class ClearVarEventHandler<T> implements AfterNeedsActiveEventHandler<T> {

    @Override
    public T execute(CommandContext commandContext) {
        CommandContext context = Context.getCommandContext();
        if (context.getAttribute("taskId") == null || !(context.getAttribute("taskId") instanceof String)) {
            return null;
        }
        String taskId = String.valueOf(context.getAttribute("taskId"));
        HistoricTaskInstanceEntity historicTaskInstanceEntity = context.getHistoricTaskInstanceEntityManager().findById(taskId);
        if (historicTaskInstanceEntity == null) {
            return null;
        }
        String piid = historicTaskInstanceEntity.getProcessInstanceId();
        context.getVariableInstanceEntityManager().deleteGarbageVariableInstanceByProcessInstanceId(piid);
        return null;
    }
}
